JPS6036006B2 - positioning device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a special positioning device that utilizes string vibrations.

When a string is stretched and vibrated, a wave wave is generated that travels along the string and is reflected at both ends, producing a fundamental wave and overtones.

The present invention provides a highly accurate positioning device that utilizes the transverse vibrations generated in the string, and uses a detection device to detect and measure the abdomen or nodes of the vibrations to perform accurate positioning. It is.

The present invention will be explained below with reference to an embodiment of the drawings. In Fig. 1, 1 is a line standard, one end la is fixed, the other end lb
is fixed to the vibrator (electrostrictive village) 2 of the vibrating device. 3 is a high frequency power source that excites the vibrator 2, and uses a frequency of approximately IK to 9 MHz.

4 is a vibrator (crystal) of the vibration detection device, and 5 is an excitation power source, which also vibrates at about IK to 9 MHz.

6 is a detector for detecting changes in vibration of the vibrator 4;

As shown in FIG. 2, the detection device has a concave reflecting mirror 9 surrounding the line 1, and a vibrator 4 is placed at the focal point of the mirror 9 to form a concentrated discrimination type. The vibrator 4 is configured to move parallel to the line 1 while maintaining a predetermined interval. High frequency power supply 3
The vibrator 2 excited by gives a constant vibration to the wire 1, and when the tension of the wire 1 is adjusted, the wire 1 generates vibration with nodes la and lb at both ends as shown by the dotted line.

Since line 1 resonates with vibrator 2, the frequency of line 1 becomes equal to that of vibrator 2. If the frequency N is the sound speed v and the wavelength ^, then N = ÷ V. The speed v is the tension T and the linear density.

Then, put V= and then N=÷stop.Then, if the frequency N of oscillator 2 is constant, and line 1 resonates with it, N and 〇 are constant, so if the tension T-......, then the upper From the formula, the input becomes 1/, main 2, 1/3, 1/4... As shown in the figure, by controlling the reduction of the tension T, it is possible to generate vibrations divided into required categories, that is, overtones. can.

It is necessary that a large number of overtone sections be generated, and the required number of sections is set by controlling the tension T. The wavelength of each division is the same, that is, the intervals between the vibration antinode and the antinode, and between the muscle and the node are equal, and are equivalent to a scale scale. By detecting this with the detection device 4, positioning and length can be detected. do. The vibrator 4 of the detection device is making high-frequency minute vibrations by the excitation power source 5, and when this moves in parallel along the linear standard 1,
The vibration state of the vibrator 4 changes at the abdomen, nodes, etc. of the vibrating wire 1, and the position can be detected by determining this changing state with the detector 6.

That is, the vibration of the line 1 generates a sound wave in the medium air with a frequency equal to that of the line 1, which acts on the opposing detection vibrator 4. In the abdomen of line 1, the acting force is the lowest at the highest node,
The interference changes the vibration of the vibrator 4. Of course, even if the detection vibrator 4 is not self-excited, detection can be performed by receiving the vibration of the line 1, but by vibrating the vibrator 4 itself by the vibration power source 5, the interference effect due to the vibration of the line 1 is strengthened. Since the vibration changes between the abdomen and the joints are extremely large and can be easily detected with high sensitivity, positioning and detection can be performed. FIG. 3 shows another embodiment of the detection device, in which a ring vibrating body 7 is provided coaxially with the linear standard 1.
A vibrator 8 is inserted into a part of the vibrating body, and is excited by a high frequency power source 5.

The sound waves caused by the vibration of the wire 1 are received by the coaxial vibrator 7 interposed around the entire circumference and act on the vibrator 8, which has the effect of greatly improving the detection sensitivity. A liquid can also be used as the vibration medium, and its high density increases sensitivity, which is advantageous. FIG. 4 shows an embodiment of a detection device that directly contacts and detects the vibrating linear standard 1, in which 10 is a contact, 11 is a vibrator, and 12 is an excitation power source. Figure 5 shows the horn-shaped contact 13.
and a lightning strain, magnetostriction, etc. detector 14, each of which detects by bringing its tip contactor into contact with the linear standard 1.

Since the vibration state is different between the antinode and the node of the transverse vibration of the line 1, it can be easily detected and the position can be detected accurately. In addition to the metal wire, synthetic resin and other non-metallic materials can be used for the linear standard 1, and silent metal is also effective.

By detecting the antinode of the line standard that is forcibly vibrated by the vibration source or while moving the detection device as described above, the wavelength between each division of the overtone is equal, and the positions and intervals of the antinode and node are equal. are equal, so the position and length interval along the linear standard can be detected with high sensitivity and precision.

Further, since the number of overtone divisions of the vibrating linear standard can be arbitrarily set to a large number by controlling the tension, short lengths and positions can be easily detected with high precision. In addition, by installing a vibrator that vibrates constantly as a detection device and detecting vibration changes due to interference effects, it is possible to detect the antinodes and nodes of the vibration of the linear standard with high sensitivity, which also improves the detection and measurement accuracy. be able to.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an embodiment of the present invention, FIG. 2 is a side sectional view of the detection device, and FIGS. 3, 4, and 5 are side sectional views of other detection devices. 1 is a linear standard, 2 is a vibrator, 4, 8, and 11 are detection vibrators, 3, 5, and 12 are high-frequency power sources, and 6 is a detector. 2'8, 91, 41, 5 legs

Claims (1)

[Scope of Claims] 1. A linear standard with both ends supported, a vibrating device that applies forced vibration to the linear standard, and a vibration detection device that moves in parallel in close opposition to the linear standard; A large number of overtones are generated by controlling the tension of the linear standard that vibrates resonantly with a vibrating device, and the detecting device that moves the abdomen or nodes detects and locates the harmonics. A positioning device characterized by: 2. The positioning device according to claim 1, wherein the detection device comprises a vibrator and a high-frequency power source that applies high-frequency minute vibrations to the vibrator.